RENNtech Intermediate ECU Upgrade | W221 | S 63 AMG | Sedan | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 mercedes-benz-c-class--203---2001-2007--c-32-amg-esr5956880 C 400 BiTurbo (W205 -

C 400 BiTurbo (W205 - M276 Biturbo 4-MATIC Engine) Modified Performance:

This process creates a laminate with a precisely controlled resin volume and in turn is 20-30% stiffer and stronger than an equivalent thickness wet laminate process

0L V8 BiTurbo)  Modified Performance (at crank):

The OG RENNtech logo underscores Hartmut Feyhl's direct lineage from AMG and his role in shaping the Hammer legacy

RENNtech Intermediate ECU Upgrade | W221 | S 63 AMG | Sedan | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 mercedes-benz-c-class--203---2001-2007--c-32-amg-esr5956880 C 400 BiTurbo (W205 -Intermediate ECU Upgrade Up to 638HP 695TQ Gains: +75HP +101TQ RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle